In Bohr series of lines of hydrogen spectrum, the third line from the red corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom of hydrogen?
A
2→5
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B
3→2
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C
5→2
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D
4→1
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Solution
The correct option is D5→2
Red means its a part of visible region. Balmer series cooresponds to visible region. In balmer series n1 =2 third line means n2 -n1 =3 so n2 =3+2=5.
For the third line from the red end, n=5. so, the transition will be 5→2